Best local LLM setup under £1500 for coding (2026)

At £1500 for coding, a real build is achievable: Qwen2.5-Coder-32B-Instruct Q4_K_M for around £403 — the best coding value at this budget.

Used office tower + Tesla P40 24GB

£340–£465

runs Qwen2.5-Coder-32B-Instruct Q4_K_M

no published benchmark yet

Qwen2.5-Coder-32B-Instruct Q4_K_M for around £403 — the best coding value at this budget

  • This is a noisy, fiddly, enthusiast build — not for someone who wants it to 'just work'
  • Corporate towers (Dell OptiPlex, HP EliteDesk/ProDesk) often ship with proprietary or low-wattage PSUs — check for a free PCIe x16 slot, physical case clearance, and budget for a replacement 750W PSU before buying a GPU for it
  • Passive cooling only — no fan. You must fit a 3D-printed shroud and a high-static-pressure fan or it will thermal-throttle
  • No video output at all — you need a second GPU or the host's onboard/iGPU video for a display
  • Requires 'Above 4G Decoding' / Re-Size BAR enabled in the host BIOS to be recognised correctly
  • Pascal architecture with no Tensor Cores — markedly slower than a same-VRAM RTX card, so pin your driver/CUDA versions and avoid bleeding-edge llama.cpp builds that assume newer GPUs
  • Draws ~250W continuously under load — a real electricity cost if left on
  • Buy new, not used, and confirm it has enough spare 8-pin PCIe power connectors for the GPU you're pairing it with — a failing or underpowered PSU can take a used GPU down with it

What's in it

Prices checked: 2026-08-26

How to put it together
  1. Enable 'Above 4G Decoding' / Re-Size BAR in the motherboard BIOS before installing the card
  2. 3D-print (or buy printed) a P40 fan shroud and fit a high-static-pressure 40-92mm fan to it
  3. Fit the 750W PSU and connect the two 8-pin EPS/PCIe power leads the P40 needs (check your specific card's power connector — some use CPU EPS connectors via an adapter)
  4. Seat the P40 in the primary PCIe x16 slot; keep the onboard/iGPU video output connected for the display
  5. Install the datacentre driver branch for Pascal and pin that driver version — avoid unattended driver upgrades
  6. Install llama.cpp with CUDA support and load a Q4_K_M model to confirm GPU offload and check temperatures under load
  • Confirm the fan shroud fan is powered from a fan header or molex before first boot — running the card without airflow for even a few minutes under load risks thermal throttling or damage

Used office tower + RTX 3090

£950–£1120

runs Qwen2.5-Coder-32B-Instruct Q4_K_M

no published benchmark yet

Qwen2.5-Coder-32B-Instruct Q4_K_M for around £1035 — a strong coding option at this budget

  • Noisy under load
  • Corporate towers (Dell OptiPlex, HP EliteDesk/ProDesk) often ship with proprietary or low-wattage PSUs — check for a free PCIe x16 slot, physical case clearance, and budget for a replacement 750W PSU before buying a GPU for it
  • Needs 2×8-pin PCIe power — check the host PSU before buying
  • No warranty on used cards; test with a memory stress tool on arrival
  • 2026 DRAM/GDDR shortage has pushed used prices to roughly double the 2024-25 norm, and a 3090 alone now costs more than a tower and PSU combined — shop around, don't assume older price guides still apply, and don't expect this to be a budget tier
  • Buy new, not used, and confirm it has enough spare 8-pin PCIe power connectors for the GPU you're pairing it with — a failing or underpowered PSU can take a used GPU down with it

What's in it

Prices checked: 2026-08-26

How to put it together
  1. Open the tower side panel and remove the existing PSU
  2. Fit the 750W PSU and connect motherboard 24-pin and CPU 8-pin
  3. Seat the 3090 in the top PCIe x16 slot and connect both 8-pin PCIe cables
  4. Boot, install drivers, then run a llama.cpp model to confirm GPU offload
  • Many office towers have short cases — check card length (~313mm) fits before buying

Used office tower + RTX 3060 12GB

£325–£420

runs Qwen2.5-Coder-14B-Instruct Q4_K_M

no published benchmark yet

Qwen2.5-Coder-14B-Instruct Q4_K_M for around £373 — a strong coding option at this budget

  • Limited to models that comfortably fit in 12GB VRAM (roughly 8B-class at Q4)
  • Cheapest way into a usable local chat rig as of August 2026
  • Corporate towers (Dell OptiPlex, HP EliteDesk/ProDesk) often ship with proprietary or low-wattage PSUs — check for a free PCIe x16 slot, physical case clearance, and budget for a replacement 750W PSU before buying a GPU for it
  • Needs a PSU with a free 8-pin PCIe connector
  • Plain GDDR6 (not GDDR6X) has kept this card largely insulated from the 2026 memory-chip shortage — currently the best £/VRAM entry point
  • Buy new, not used, and confirm it has enough spare 8-pin PCIe power connectors for the GPU you're pairing it with — a failing or underpowered PSU can take a used GPU down with it

What's in it

Prices checked: 2026-08-26

How to put it together
  1. Open the tower side panel and check for a free PCIe x16 slot and an 8-pin PCIe power lead
  2. Fit the 750W PSU if the stock one lacks an 8-pin PCIe connector, wiring the 24-pin motherboard and CPU 8-pin
  3. Seat the RTX 3060 in the primary PCIe x16 slot and connect the 8-pin PCIe cable
  4. Boot into the OS and install the latest NVIDIA driver
  5. Install Ollama or llama.cpp and pull a Q4_K_M model to confirm it loads onto the GPU
  • Office towers with a proprietary (e.g. SFX or low-wattage) PSU won't have a spare PCIe power lead — check before assuming the stock PSU is enough

Used office tower + RTX 4060 Ti 16GB

£480–£675

runs Qwen2.5-Coder-14B-Instruct Q4_K_M

no published benchmark yet

Qwen2.5-Coder-14B-Instruct Q4_K_M for around £578 — a strong coding option at this budget

  • 16GB VRAM is enough for a genuinely useful 14B coding model at Q4
  • Lower power draw (165W) than a 3060 Ti/3090 build, so it can run on a cheaper PSU if you already have one with a free 8-pin
  • Corporate towers (Dell OptiPlex, HP EliteDesk/ProDesk) often ship with proprietary or low-wattage PSUs — check for a free PCIe x16 slot, physical case clearance, and budget for a replacement 750W PSU before buying a GPU for it
  • Only a x8 PCIe link on most models — negligible effect on LLM inference, but worth knowing
  • Prices have risen noticeably since spring 2026 alongside broader GPU memory shortages; current live listings sit well above older price-tracker averages
  • Buy new, not used, and confirm it has enough spare 8-pin PCIe power connectors for the GPU you're pairing it with — a failing or underpowered PSU can take a used GPU down with it

What's in it

Prices checked: 2026-08-26

How to put it together
  1. Open the tower side panel and check for a free PCIe x16 slot
  2. Fit the 750W PSU, connecting the 24-pin motherboard and CPU 8-pin leads
  3. Seat the RTX 4060 Ti in the primary PCIe x16 slot and connect its 8-pin PCIe power cable
  4. Boot, install the latest NVIDIA driver, and confirm the card is detected (nvidia-smi)
  5. Install llama.cpp or Ollama and load a Q4_K_M 14B model to confirm full GPU offload
  • Some 4060 Ti cards are 2.5-3 slots wide — measure your case clearance, not just card length

Try your exact budget in the full configurator →